Interacting fermions in narrow-gap semiconductors with band inversion
| Autor: | Maxim Dzero, Suman Raj Panday |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Physics
Condensed matter physics Strongly Correlated Electrons (cond-mat.str-el) Samarium hexaboride Kondo insulator FOS: Physical sciences 02 engineering and technology Narrow-gap semiconductor Fermion Electron Renormalization group 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Condensed Matter - Strongly Correlated Electrons 0103 physical sciences Quasiparticle General Materials Science Symmetry breaking 010306 general physics 0210 nano-technology |
| Popis: | Highly unconventional behavior of the thermodynamic response functions has been experimentally observed in a narrow gap semiconductor samarium hexaboride. Motivated by these observations, we use renormalization group technique to investigate many-body instabilities in the f-orbital narrow gap semiconductors with band inversion in the limit of weak coupling. After projecting out the double occupancy of the f-orbital states, we formulate a low-energy theory describing the interacting particles in two hybridized electron- and hole-like bands. The interactions are assumed to be weak and short-ranged. We take into account the difference between the effective masses of the quasiparticles in each band. Upon carrying out the renormalization group analysis we find that there is only one stable fixed point corresponding to the excitonic instability with time-reversal symmetry breaking for small enough mismatch between the effective masses. 11 pages, 4 figures |
| Databáze: | OpenAIRE |
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